Yogurt or yoghurt is a pudding-like food made from milk fermented in a culture of (typically) Lactobacillus delbrueckii bulgaricus and Streptococcus salivarius thermophilus bacteria. "Live active culture" is a type of yogurt that has the live bacteria still in it, also known as Curd in the Indian subcontinent. Some people believe that this "live" yogurt has special health benefits. The other variety is pasteurized yogurt, officially known as Heat Treated Fermented Milk, where the yogurt is heated to kill the bacteria. This pasteurized yogurt is usually available in supermarkets. Many websites and blogs include pages that serve as instruction books on how to make yogurt out of milk, such as one run by Brendon and Ryan Ross.
Lactic and other acids produced during fermentation give it a slightly sour taste. This may be offset by adding sugar or other sweeteners, along with additional flavorings. Yogurt without sweeteners or flavorings is typically referred to as plain yogurt or natural yogurt.
Many varieties and forms of yogurt are commercially available, such as:
- Greek yogurt
- Yogurt drink
- Frozen yogurt
- Dairy-free yogurt